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        <channel>
                <title>Petter Reinholdtsen</title>
                <description></description>
                <link>http://people.skolelinux.org/pere/blog/</link>
                <atom:link href="http://people.skolelinux.org/pere/blog/index.rss" rel="self" type="application/rss+xml" />
        
        <item>
                <title>Metadata proposal for movies on the Internet Archive</title>
                <link>http://people.skolelinux.org/pere/blog/Metadata_proposal_for_movies_on_the_Internet_Archive.html</link>
                <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Metadata_proposal_for_movies_on_the_Internet_Archive.html</guid>
                <pubDate>Tue, 28 Nov 2017 12:00:00 +0100</pubDate>
                <description>&lt;p&gt;It would be easier to locate the movie you want to watch in
&lt;a href=&quot;https://www.archive.org/&quot;&gt;the Internet Archive&lt;/a&gt;, if the
metadata about each movie was more complete and accurate.  In the
archiving community, a well known saying state that good metadata is a
love letter to the future.  The metadata in the Internet Archive could
use a face lift for the future to love us back.  Here is a proposal
for a small improvement that would make the metadata more useful
today.  I&#39;ve been unable to find any document describing the various
standard fields available when uploading videos to the archive, so
this proposal is based on my best quess and searching through several
of the existing movies.&lt;/p&gt;

&lt;p&gt;I have a few use cases in mind.  First of all, I would like to be
able to count the number of distinct movies in the Internet Archive,
without duplicates.  I would further like to identify the IMDB title
ID of the movies in the Internet Archive, to be able to look up a IMDB
title ID and know if I can fetch the video from there and share it
with my friends.&lt;/p&gt;

&lt;p&gt;Second, I would like the Butter data provider for The Internet
archive
(&lt;a href=&quot;https://github.com/butterproviders/butter-provider-archive&quot;&gt;available
from github&lt;/a&gt;), to list as many of the good movies as possible.  The
plugin currently do a search in the archive with the following
parameters:&lt;/p&gt;

&lt;p&gt;&lt;pre&gt;
collection:moviesandfilms
AND NOT collection:movie_trailers
AND -mediatype:collection
AND format:&quot;Archive BitTorrent&quot;
AND year
&lt;/pre&gt;&lt;/p&gt;

&lt;p&gt;Most of the cool movies that fail to show up in Butter do so
because the &#39;year&#39; field is missing.  The &#39;year&#39; field is populated by
the year part from the &#39;date&#39; field, and should be when the movie was
released (date or year).  Two such examples are
&lt;a href=&quot;https://archive.org/details/SidneyOlcottsBen-hur1905&quot;&gt;Ben Hur
from 1905&lt;/a&gt; and
&lt;a href=&quot;https://archive.org/details/Caminandes2GranDillama&quot;&gt;Caminandes
2: Gran Dillama from 2013&lt;/a&gt;, where the year metadata field is
missing.&lt;/p&gt;

So, my proposal is simply, for every movie in The Internet Archive
where an IMDB title ID exist, please fill in these metadata fields
(note, they can be updated also long after the video was uploaded, but
as far as I can tell, only by the uploader):

&lt;dl&gt;

&lt;dt&gt;mediatype&lt;/dt&gt;
&lt;dd&gt;Should be &#39;movie&#39; for movies.&lt;/dd&gt;

&lt;dt&gt;collection&lt;/dt&gt;
&lt;dd&gt;Should contain &#39;moviesandfilms&#39;.&lt;/dd&gt;

&lt;dt&gt;title&lt;/dt&gt;
&lt;dd&gt;The title of the movie, without the publication year.&lt;/dd&gt;

&lt;dt&gt;date&lt;/dt&gt;
&lt;dd&gt;The data or year the movie was released.  This make the movie show
up in Butter, as well as make it possible to know the age of the
movie and is useful to figure out copyright status.&lt;/dd&gt;

&lt;dt&gt;director&lt;/dt&gt;
&lt;dd&gt;The director of the movie.  This make it easier to know if the
correct movie is found in movie databases.&lt;/dd&gt;

&lt;dt&gt;publisher&lt;/dt&gt;
&lt;dd&gt;The production company making the movie.  Also useful for
identifying the correct movie.&lt;/dd&gt;

&lt;dt&gt;links&lt;/dt&gt;

&lt;dd&gt;Add a link to the IMDB title page, for example like this: &amp;lt;a
href=&quot;http://www.imdb.com/title/tt0028496/&quot;&amp;gt;Movie in
IMDB&amp;lt;/a&amp;gt;.  This make it easier to find duplicates and allow for
counting of number of unique movies in the Archive.  Other external
references, like to TMDB, could be added like this too.&lt;/dd&gt;

&lt;/dl&gt;

&lt;p&gt;I did consider proposing a Custom field for the IMDB title ID (for
example &#39;imdb_title_url&#39;, &#39;imdb_code&#39; or simply &#39;imdb&#39;, but suspect it
will be easier to simply place it in the links free text field.&lt;/p&gt;

&lt;p&gt;I created
&lt;a href=&quot;https://github.com/petterreinholdtsen/public-domain-free-imdb&quot;&gt;a
list of IMDB title IDs for several thousand movies in the Internet
Archive&lt;/a&gt;, but I also got a list of several thousand movies without
such IMDB title ID (and quite a few duplicates).  It would be great if
this data set could be integrated into the Internet Archive metadata
to be available for everyone in the future, but with the current
policy of leaving metadata editing to the uploaders, it will take a
while before this happen.  If you have uploaded movies into the
Internet Archive, you can help.  Please consider following my proposal
above for your movies, to ensure that movie is properly
counted. :)&lt;/p&gt;

&lt;p&gt;The list is mostly generated using wikidata, which based on
Wikipedia articles make it possible to link between IMDB and movies in
the Internet Archive.  But there are lots of movies without a
Wikipedia article, and some movies where only a collection page exist
(like for &lt;a href=&quot;https://en.wikipedia.org/wiki/Caminandes&quot;&gt;the
Caminandes example above&lt;/a&gt;, where there are three movies but only
one Wikidata entry).&lt;/p&gt;
</description>
        </item>
        
        <item>
                <title>Legal to share more than 3000 movies listed on IMDB?</title>
                <link>http://people.skolelinux.org/pere/blog/Legal_to_share_more_than_3000_movies_listed_on_IMDB_.html</link>
                <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Legal_to_share_more_than_3000_movies_listed_on_IMDB_.html</guid>
                <pubDate>Sat, 18 Nov 2017 21:20:00 +0100</pubDate>
                <description>&lt;p&gt;A month ago, I blogged about my work to
&lt;a href=&quot;http://people.skolelinux.org/pere/blog/Locating_IMDB_IDs_of_movies_in_the_Internet_Archive_using_Wikidata.html&quot;&gt;automatically
check the copyright status of IMDB entries&lt;/a&gt;, and try to count the
number of movies listed in IMDB that is legal to distribute on the
Internet.  I have continued to look for good data sources, and
identified a few more.  The code used to extract information from
various data sources is available in
&lt;a href=&quot;https://github.com/petterreinholdtsen/public-domain-free-imdb&quot;&gt;a
git repository&lt;/a&gt;, currently available from github.&lt;/p&gt;

&lt;p&gt;So far I have identified 3186 unique IMDB title IDs.  To gain
better understanding of the structure of the data set, I created a
histogram of the year associated with each movie (typically release
year).  It is interesting to notice where the peaks and dips in the
graph are located.  I wonder why they are placed there.  I suspect
World War II caused the dip around 1940, but what caused the peak
around 2010?&lt;/p&gt;

&lt;p align=&quot;center&quot;&gt;&lt;img src=&quot;http://people.skolelinux.org/pere/blog/images/2017-11-18-verk-i-det-fri-filmer.png&quot; /&gt;&lt;/p&gt;

&lt;p&gt;I&#39;ve so far identified ten sources for IMDB title IDs for movies in
the public domain or with a free license.  This is the statistics
reported when running &#39;make stats&#39; in the git repository:&lt;/p&gt;

&lt;pre&gt;
  249 entries (    6 unique) with and   288 without IMDB title ID in free-movies-archive-org-butter.json
 2301 entries (  540 unique) with and     0 without IMDB title ID in free-movies-archive-org-wikidata.json
  830 entries (   29 unique) with and     0 without IMDB title ID in free-movies-icheckmovies-archive-mochard.json
 2109 entries (  377 unique) with and     0 without IMDB title ID in free-movies-imdb-pd.json
  291 entries (  122 unique) with and     0 without IMDB title ID in free-movies-letterboxd-pd.json
  144 entries (  135 unique) with and     0 without IMDB title ID in free-movies-manual.json
  350 entries (    1 unique) with and   801 without IMDB title ID in free-movies-publicdomainmovies.json
    4 entries (    0 unique) with and   124 without IMDB title ID in free-movies-publicdomainreview.json
  698 entries (  119 unique) with and   118 without IMDB title ID in free-movies-publicdomaintorrents.json
    8 entries (    8 unique) with and   196 without IMDB title ID in free-movies-vodo.json
 3186 unique IMDB title IDs in total
&lt;/pre&gt;

&lt;p&gt;The entries without IMDB title ID are candidates to increase the
data set, but might equally well be duplicates of entries already
listed with IMDB title ID in one of the other sources, or represent
movies that lack a IMDB title ID.  I&#39;ve seen examples of all these
situations when peeking at the entries without IMDB title ID.  Based
on these data sources, the lower bound for movies listed in IMDB that
are legal to distribute on the Internet is between 3186 and 4713.

&lt;p&gt;It would be great for improving the accuracy of this measurement,
if the various sources added IMDB title ID to their metadata.  I have
tried to reach the people behind the various sources to ask if they
are interested in doing this, without any replies so far.  Perhaps you
can help me get in touch with the people behind VODO, Public Domain
Torrents, Public Domain Movies and Public Domain Review to try to
convince them to add more metadata to their movie entries?&lt;/p&gt;

&lt;p&gt;Another way you could help is by adding pages to Wikipedia about
movies that are legal to distribute on the Internet.  If such page
exist and include a link to both IMDB and The Internet Archive, the
script used to generate free-movies-archive-org-wikidata.json should
pick up the mapping as soon as wikidata is updates.&lt;/p&gt;

&lt;p&gt;As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
&lt;b&gt;&lt;a href=&quot;bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&quot;&gt;15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&lt;/a&gt;&lt;/b&gt;.&lt;/p&gt;
</description>
        </item>
        
        <item>
                <title>Some notes on fault tolerant storage systems</title>
                <link>http://people.skolelinux.org/pere/blog/Some_notes_on_fault_tolerant_storage_systems.html</link>
                <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Some_notes_on_fault_tolerant_storage_systems.html</guid>
                <pubDate>Wed, 1 Nov 2017 15:35:00 +0100</pubDate>
                <description>&lt;p&gt;If you care about how fault tolerant your storage is, you might
find these articles and papers interesting.  They have formed how I
think of when designing a storage system.&lt;/p&gt;

&lt;ul&gt;

&lt;li&gt;USENIX :login; &lt;a
href=&quot;https://www.usenix.org/publications/login/summer2017/ganesan&quot;&gt;Redundancy
Does Not Imply Fault Tolerance.  Analysis of Distributed Storage
Reactions to Single Errors and Corruptions&lt;/a&gt; by Aishwarya Ganesan,
Ramnatthan Alagappan, Andrea C. Arpaci-Dusseau, and Remzi
H. Arpaci-Dusseau&lt;/li&gt;

&lt;li&gt;ZDNet
&lt;a href=&quot;http://www.zdnet.com/article/why-raid-5-stops-working-in-2009/&quot;&gt;Why
RAID 5 stops working in 2009&lt;/a&gt; by Robin Harris&lt;/li&gt;

&lt;li&gt;ZDNet
&lt;a href=&quot;http://www.zdnet.com/article/why-raid-6-stops-working-in-2019/&quot;&gt;Why
RAID 6 stops working in 2019&lt;/a&gt; by Robin Harris&lt;/li&gt;

&lt;li&gt;USENIX FAST&#39;07
&lt;a href=&quot;http://research.google.com/archive/disk_failures.pdf&quot;&gt;Failure
Trends in a Large Disk Drive Population&lt;/a&gt; by Eduardo Pinheiro,
Wolf-Dietrich Weber and Luiz André Barroso&lt;/li&gt;

&lt;li&gt;USENIX ;login: &lt;a
href=&quot;https://www.usenix.org/system/files/login/articles/hughes12-04.pdf&quot;&gt;Data
Integrity.  Finding Truth in a World of Guesses and Lies&lt;/a&gt; by Doug
Hughes&lt;/li&gt;

&lt;li&gt;USENIX FAST&#39;08
&lt;a href=&quot;https://www.usenix.org/events/fast08/tech/full_papers/bairavasundaram/bairavasundaram_html/&quot;&gt;An
Analysis of Data Corruption in the Storage Stack&lt;/a&gt; by
L. N. Bairavasundaram, G. R. Goodson, B. Schroeder, A. C.
Arpaci-Dusseau, and R. H. Arpaci-Dusseau&lt;/li&gt;

&lt;li&gt;USENIX FAST&#39;07 &lt;a
href=&quot;https://www.usenix.org/legacy/events/fast07/tech/schroeder/schroeder_html/&quot;&gt;Disk
failures in the real world: what does an MTTF of 1,000,000 hours mean
to you?&lt;/a&gt; by B. Schroeder and G. A. Gibson.&lt;/li&gt;

&lt;li&gt;USENIX ;login: &lt;a
href=&quot;https://www.usenix.org/events/fast08/tech/full_papers/jiang/jiang_html/&quot;&gt;Are
Disks the Dominant Contributor for Storage Failures?  A Comprehensive
Study of Storage Subsystem Failure Characteristics&lt;/a&gt; by Weihang
Jiang, Chongfeng Hu, Yuanyuan Zhou, and Arkady Kanevsky&lt;/li&gt;

&lt;li&gt;SIGMETRICS 2007
&lt;a href=&quot;http://research.cs.wisc.edu/adsl/Publications/latent-sigmetrics07.pdf&quot;&gt;An
analysis of latent sector errors in disk drives&lt;/a&gt; by
L. N. Bairavasundaram, G. R. Goodson, S. Pasupathy, and J. Schindler&lt;/li&gt;

&lt;/ul&gt;

&lt;p&gt;Several of these research papers are based on data collected from
hundred thousands or millions of disk, and their findings are eye
opening.  The short story is simply do not implicitly trust RAID or
redundant storage systems.  Details matter.  And unfortunately there
are few options on Linux addressing all the identified issues.  Both
ZFS and Btrfs are doing a fairly good job, but have legal and
practical issues on their own.  I wonder how cluster file systems like
Ceph do in this regard.  After all, there is an old saying, you know
you have a distributed system when the crash of a computer you have
never heard of stops you from getting any work done.  The same holds
true if fault tolerance do not work.&lt;/p&gt;

&lt;p&gt;Just remember, in the end, it do not matter how redundant, or how
fault tolerant your storage is, if you do not continuously monitor its
status to detect and replace failed disks.&lt;/p&gt;

&lt;p&gt;As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
&lt;b&gt;&lt;a href=&quot;bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&quot;&gt;15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&lt;/a&gt;&lt;/b&gt;.&lt;/p&gt;
</description>
        </item>
        
        <item>
                <title>Web services for writing academic LaTeX papers as a team</title>
                <link>http://people.skolelinux.org/pere/blog/Web_services_for_writing_academic_LaTeX_papers_as_a_team.html</link>
                <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Web_services_for_writing_academic_LaTeX_papers_as_a_team.html</guid>
                <pubDate>Tue, 31 Oct 2017 21:00:00 +0100</pubDate>
                <description>&lt;p&gt;I was surprised today to learn that a friend in academia did not
know there are easily available web services available for writing
LaTeX documents as a team.  I thought it was common knowledge, but to
make sure at least my readers are aware of it, I would like to mention
these useful services for writing LaTeX documents.  Some of them even
provide a WYSIWYG editor to ease writing even further.&lt;/p&gt;

&lt;p&gt;There are two commercial services available,
&lt;a href=&quot;https://sharelatex.com&quot;&gt;ShareLaTeX&lt;/a&gt; and
&lt;a href=&quot;https://overleaf.com&quot;&gt;Overleaf&lt;/a&gt;.  They are very easy to
use.  Just start a new document, select which publisher to write for
(ie which LaTeX style to use), and start writing.  Note, these two
have announced their intention to join forces, so soon it will only be
one joint service.  I&#39;ve used both for different documents, and they
work just fine.  While
&lt;a href=&quot;https://github.com/sharelatex/sharelatex&quot;&gt;ShareLaTeX is free
software&lt;/a&gt;, while the latter is not.  According to &lt;a
href=&quot;https://www.overleaf.com/help/17-is-overleaf-open-source&quot;&gt;a
announcement from Overleaf&lt;/a&gt;, they plan to keep the ShareLaTeX code
base maintained as free software.&lt;/p&gt;

But these two are not the only alternatives.
&lt;a href=&quot;https://app.fiduswriter.org/&quot;&gt;Fidus Writer&lt;/a&gt; is another free
software solution with &lt;a href=&quot;https://github.com/fiduswriter&quot;&gt;the
source available on github&lt;/a&gt;.  I have not used it myself.  Several
others can be found on the nice
&lt;a href=&quot;https://alternativeto.net/software/sharelatex/&quot;&gt;alterntiveTo
web service&lt;/a&gt;.

&lt;p&gt;If you like Google Docs or Etherpad, but would like to write
documents in LaTeX, you should check out these services.  You can even
host your own, if you want to. :)&lt;/p&gt;

&lt;p&gt;As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
&lt;b&gt;&lt;a href=&quot;bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&quot;&gt;15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&lt;/a&gt;&lt;/b&gt;.&lt;/p&gt;
</description>
        </item>
        
        <item>
                <title>Locating IMDB IDs of movies in the Internet Archive using Wikidata</title>
                <link>http://people.skolelinux.org/pere/blog/Locating_IMDB_IDs_of_movies_in_the_Internet_Archive_using_Wikidata.html</link>
                <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Locating_IMDB_IDs_of_movies_in_the_Internet_Archive_using_Wikidata.html</guid>
                <pubDate>Wed, 25 Oct 2017 12:20:00 +0200</pubDate>
                <description>&lt;p&gt;Recently, I needed to automatically check the copyright status of a
set of &lt;a href=&quot;http://www.imdb.com/&quot;&gt;The Internet Movie database
(IMDB)&lt;/a&gt; entries, to figure out which one of the movies they refer
to can be freely distributed on the Internet.  This proved to be
harder than it sounds.  IMDB for sure list movies without any
copyright protection, where the copyright protection has expired or
where the movie is lisenced using a permissive license like one from
Creative Commons.  These are mixed with copyright protected movies,
and there seem to be no way to separate these classes of movies using
the information in IMDB.&lt;/p&gt;

&lt;p&gt;First I tried to look up entries manually in IMDB,
&lt;a href=&quot;https://www.wikipedia.org/&quot;&gt;Wikipedia&lt;/a&gt; and
&lt;a href=&quot;https://www.archive.org/&quot;&gt;The Internet Archive&lt;/a&gt;, to get a
feel how to do this.  It is hard to know for sure using these sources,
but it should be possible to be reasonable confident a movie is &quot;out
of copyright&quot; with a few hours work per movie.  As I needed to check
almost 20,000 entries, this approach was not sustainable.  I simply
can not work around the clock for about 6 years to check this data
set.&lt;/p&gt;

&lt;p&gt;I asked the people behind The Internet Archive if they could
introduce a new metadata field in their metadata XML for IMDB ID, but
was told that they leave it completely to the uploaders to update the
metadata.  Some of the metadata entries had IMDB links in the
description, but I found no way to download all metadata files in bulk
to locate those ones and put that approach aside.&lt;/p&gt;

&lt;p&gt;In the process I noticed several Wikipedia articles about movies
had links to both IMDB and The Internet Archive, and it occured to me
that I could use the Wikipedia RDF data set to locate entries with
both, to at least get a lower bound on the number of movies on The
Internet Archive with a IMDB ID.  This is useful based on the
assumption that movies distributed by The Internet Archive can be
legally distributed on the Internet.  With some help from the RDF
community (thank you DanC), I was able to come up with this query to
pass to &lt;a href=&quot;https://query.wikidata.org/&quot;&gt;the SPARQL interface on
Wikidata&lt;/a&gt;:

&lt;p&gt;&lt;pre&gt;
SELECT ?work ?imdb ?ia ?when ?label
WHERE
{
  ?work wdt:P31/wdt:P279* wd:Q11424.
  ?work wdt:P345 ?imdb.
  ?work wdt:P724 ?ia.
  OPTIONAL {
        ?work wdt:P577 ?when.
        ?work rdfs:label ?label.
        FILTER(LANG(?label) = &quot;en&quot;).
  }
}
&lt;/pre&gt;&lt;/p&gt;

&lt;p&gt;If I understand the query right, for every film entry anywhere in
Wikpedia, it will return the IMDB ID and The Internet Archive ID, and
when the movie was released and its English title, if either or both
of the latter two are available.  At the moment the result set contain
2338 entries.  Of course, it depend on volunteers including both
correct IMDB and The Internet Archive IDs in the wikipedia articles
for the movie.  It should be noted that the result will include
duplicates if the movie have entries in several languages.  There are
some bogus entries, either because The Internet Archive ID contain a
typo or because the movie is not available from The Internet Archive.
I did not verify the IMDB IDs, as I am unsure how to do that
automatically.&lt;/p&gt;

&lt;p&gt;I wrote a small python script to extract the data set from Wikidata
and check if the XML metadata for the movie is available from The
Internet Archive, and after around 1.5 hour it produced a list of 2097
free movies and their IMDB ID.  In total, 171 entries in Wikidata lack
the refered Internet Archive entry.  I assume the 70 &quot;disappearing&quot;
entries (ie 2338-2097-171) are duplicate entries.&lt;/p&gt;

&lt;p&gt;This is not too bad, given that The Internet Archive report to
contain &lt;a href=&quot;https://archive.org/details/feature_films&quot;&gt;5331
feature films&lt;/a&gt; at the moment, but it also mean more than 3000
movies are missing on Wikipedia or are missing the pair of references
on Wikipedia.&lt;/p&gt;

&lt;p&gt;I was curious about the distribution by release year, and made a
little graph to show how the amount of free movies is spread over the
years:&lt;p&gt;

&lt;p&gt;&lt;img src=&quot;http://people.skolelinux.org/pere/blog/images/2017-10-25-verk-i-det-fri-filmer.png&quot;&gt;&lt;/p&gt;

&lt;p&gt;I expect the relative distribution of the remaining 3000 movies to
be similar.&lt;/p&gt;

&lt;p&gt;If you want to help, and want to ensure Wikipedia can be used to
cross reference The Internet Archive and The Internet Movie Database,
please make sure entries like this are listed under the &quot;External
links&quot; heading on the Wikipedia article for the movie:&lt;/p&gt;

&lt;p&gt;&lt;pre&gt;
* {{Internet Archive film|id=FightingLady}}
* {{IMDb title|id=0036823|title=The Fighting Lady}}
&lt;/pre&gt;&lt;/p&gt;

&lt;p&gt;Please verify the links on the final page, to make sure you did not
introduce a typo.&lt;/p&gt;

&lt;p&gt;Here is the complete list, if you want to correct the 171
identified Wikipedia entries with broken links to The Internet
Archive: &lt;a href=&quot;http://www.wikidata.org/entity/Q1140317&quot;&gt;Q1140317&lt;/a&gt;, 
&lt;a href=&quot;http://www.wikidata.org/entity/Q458656&quot;&gt;Q458656&lt;/a&gt;, 
&lt;a href=&quot;http://www.wikidata.org/entity/Q458656&quot;&gt;Q458656&lt;/a&gt;, 
&lt;a href=&quot;http://www.wikidata.org/entity/Q470560&quot;&gt;Q470560&lt;/a&gt;, 
&lt;a href=&quot;http://www.wikidata.org/entity/Q743340&quot;&gt;Q743340&lt;/a&gt;, 
&lt;a href=&quot;http://www.wikidata.org/entity/Q822580&quot;&gt;Q822580&lt;/a&gt;, 
&lt;a href=&quot;http://www.wikidata.org/entity/Q480696&quot;&gt;Q480696&lt;/a&gt;, 
&lt;a href=&quot;http://www.wikidata.org/entity/Q128761&quot;&gt;Q128761&lt;/a&gt;, 
&lt;a href=&quot;http://www.wikidata.org/entity/Q1307059&quot;&gt;Q1307059&lt;/a&gt;, 
&lt;a href=&quot;http://www.wikidata.org/entity/Q1335091&quot;&gt;Q1335091&lt;/a&gt;, 
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&lt;p&gt;As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
&lt;b&gt;&lt;a href=&quot;bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&quot;&gt;15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&lt;/a&gt;&lt;/b&gt;.&lt;/p&gt;
</description>
        </item>
        
        <item>
                <title>A one-way wall on the border?</title>
                <link>http://people.skolelinux.org/pere/blog/A_one_way_wall_on_the_border_.html</link>
                <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/A_one_way_wall_on_the_border_.html</guid>
                <pubDate>Sat, 14 Oct 2017 22:10:00 +0200</pubDate>
                <description>&lt;p&gt;I find it fascinating how many of the people being locked inside
the proposed border wall between USA and Mexico support the idea.  The
proposal to keep Mexicans out reminds me of
&lt;a href=&quot;http://www.history.com/news/10-things-you-may-not-know-about-the-berlin-wall&quot;&gt;the
propaganda twist from the East Germany government&lt;/a&gt; calling the wall
the “Antifascist Bulwark” after erecting the Berlin Wall, claiming
that the wall was erected to keep enemies from creeping into East
Germany, while it was obvious to the people locked inside it that it
was erected to keep the people from escaping.&lt;/p&gt;

&lt;p&gt;Do the people in USA supporting this wall really believe it is a
one way wall, only keeping people on the outside from getting in,
while not keeping people in the inside from getting out?&lt;/p&gt;

&lt;p&gt;As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
&lt;b&gt;&lt;a href=&quot;bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&quot;&gt;15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&lt;/a&gt;&lt;/b&gt;.&lt;/p&gt;
</description>
        </item>
        
        <item>
                <title>Generating 3D prints in Debian using Cura and Slic3r(-prusa)</title>
                <link>http://people.skolelinux.org/pere/blog/Generating_3D_prints_in_Debian_using_Cura_and_Slic3r__prusa_.html</link>
                <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Generating_3D_prints_in_Debian_using_Cura_and_Slic3r__prusa_.html</guid>
                <pubDate>Mon, 9 Oct 2017 10:50:00 +0200</pubDate>
                <description>&lt;p&gt;At my nearby maker space,
&lt;a href=&quot;http://sonen.ifi.uio.no/&quot;&gt;Sonen&lt;/a&gt;, I heard the story that it
was easier to generate gcode files for theyr 3D printers (Ultimake 2+)
on Windows and MacOS X than Linux, because the software involved had
to be manually compiled and set up on Linux while premade packages
worked out of the box on Windows and MacOS X.  I found this annoying,
as the software involved,
&lt;a href=&quot;https://github.com/Ultimaker/Cura&quot;&gt;Cura&lt;/a&gt;, is free software
and should be trivial to get up and running on Linux if someone took
the time to package it for the relevant distributions.  I even found
&lt;a href=&quot;https://bugs.debian.org/706656&quot;&gt;a request for adding into
Debian&lt;/a&gt; from 2013, which had seem some activity over the years but
never resulted in the software showing up in Debian.  So a few days
ago I offered my help to try to improve the situation.&lt;/p&gt;

&lt;p&gt;Now I am very happy to see that all the packages required by a
working Cura in Debian are uploaded into Debian and waiting in the NEW
queue for the ftpmasters to have a look.  You can track the progress
on
&lt;a href=&quot;https://qa.debian.org/developer.php?email=3dprinter-general%40lists.alioth.debian.org&quot;&gt;the
status page for the 3D printer team&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The uploaded packages are a bit behind upstream, and was uploaded
now to get slots in &lt;a href=&quot;https://ftp-master.debian.org/new.html&quot;&gt;the NEW
queue&lt;/a&gt; while we work up updating the packages to the latest
upstream version.&lt;/p&gt;

&lt;p&gt;On a related note, two competitors for Cura, which I found harder
to use and was unable to configure correctly for Ultimaker 2+ in the
short time I spent on it, are already in Debian.  If you are looking
for 3D printer &quot;slicers&quot; and want something already available in
Debian, check out
&lt;a href=&quot;https://tracker.debian.org/pkg/slic3r&quot;&gt;slic3r&lt;/a&gt; and
&lt;a href=&quot;https://tracker.debian.org/pkg/slic3r-prusa&quot;&gt;slic3r-prusa&lt;/a&gt;.
The latter is a fork of the former.&lt;/p&gt;

&lt;p&gt;As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
&lt;b&gt;&lt;a href=&quot;bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&quot;&gt;15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&lt;/a&gt;&lt;/b&gt;.&lt;/p&gt;
</description>
        </item>
        
        <item>
                <title>Mangler du en skrue, eller har du en skrue løs?</title>
                <link>http://people.skolelinux.org/pere/blog/Mangler_du_en_skrue__eller_har_du_en_skrue_l_s_.html</link>
                <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Mangler_du_en_skrue__eller_har_du_en_skrue_l_s_.html</guid>
                <pubDate>Wed, 4 Oct 2017 09:40:00 +0200</pubDate>
                <description>Når jeg holder på med ulike prosjekter, så trenger jeg stadig ulike
skruer.  Det siste prosjektet jeg holder på med er å lage
&lt;a href=&quot;https://www.thingiverse.com/thing:676916&quot;&gt;en boks til en
HDMI-touch-skjerm&lt;/a&gt; som skal brukes med Raspberry Pi.  Boksen settes
sammen med skruer og bolter, og jeg har vært i tvil om hvor jeg kan
få tak i de riktige skruene.  Clas Ohlson og Jernia i nærheten har
sjelden hatt det jeg trenger.  Men her om dagen fikk jeg et fantastisk
tips for oss som bor i Oslo.
&lt;a href=&quot;http://www.zachskruer.no/&quot;&gt;Zachariassen Jernvare AS&lt;/a&gt; i
&lt;a href=&quot;http://www.openstreetmap.org/?mlat=59.93421&amp;mlon=10.76795#map=19/59.93421/10.76795&quot;&gt;Hegermannsgate
23A på Torshov&lt;/a&gt; har et fantastisk utvalg, og åpent mellom 09:00 og
17:00.  De selger skruer, muttere, bolter, skiver etc i løs vekt, og
så langt har jeg fått alt jeg har lett etter.  De har i tillegg det
meste av annen jernvare, som verktøy, lamper, ledninger, etc.  Jeg
håper de har nok kunder til å holde det gående lenge, da dette er en
butikk jeg kommer til å besøke ofte.  Butikken er et funn å ha i
nabolaget for oss som liker å bygge litt selv. :)&lt;/p&gt;

&lt;p&gt;Som vanlig, hvis du bruker Bitcoin og ønsker å vise din støtte til
det jeg driver med, setter jeg pris på om du sender Bitcoin-donasjoner
til min adresse
&lt;b&gt;&lt;a href=&quot;bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&quot;&gt;15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&lt;/a&gt;&lt;/b&gt;.&lt;/p&gt;
</description>
        </item>
        
        <item>
                <title>Visualizing GSM radio chatter using gr-gsm and Hopglass</title>
                <link>http://people.skolelinux.org/pere/blog/Visualizing_GSM_radio_chatter_using_gr_gsm_and_Hopglass.html</link>
                <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Visualizing_GSM_radio_chatter_using_gr_gsm_and_Hopglass.html</guid>
                <pubDate>Fri, 29 Sep 2017 10:30:00 +0200</pubDate>
                <description>&lt;p&gt;Every mobile phone announce its existence over radio to the nearby
mobile cell towers.  And this radio chatter is available for anyone
with a radio receiver capable of receiving them.  Details about the
mobile phones with very good accuracy is of course collected by the
phone companies, but this is not the topic of this blog post.  The
mobile phone radio chatter make it possible to figure out when a cell
phone is nearby, as it include the SIM card ID (IMSI).  By paying
attention over time, one can see when a phone arrive and when it leave
an area.  I believe it would be nice to make this information more
available to the general public, to make more people aware of how
their phones are announcing their whereabouts to anyone that care to
listen.&lt;/p&gt;

&lt;p&gt;I am very happy to report that we managed to get something
visualizing this information up and running for
&lt;a href=&quot;http://norwaymakers.org/osf17&quot;&gt;Oslo Skaperfestival 2017&lt;/a&gt;
(Oslo Makers Festival) taking place today and tomorrow at Deichmanske
library.  The solution is based on the
&lt;a href=&quot;http://people.skolelinux.org/pere/blog/Easier_recipe_to_observe_the_cell_phones_around_you.html&quot;&gt;simple
recipe for listening to GSM chatter&lt;/a&gt; I posted a few days ago, and
will show up at the stand of &lt;a href=&quot;http://sonen.ifi.uio.no/&quot;&gt;Åpen
Sone from the Computer Science department of the University of
Oslo&lt;/a&gt;.  The presentation will show the nearby mobile phones (aka
IMSIs) as dots in a web browser graph, with lines to the dot
representing mobile base station it is talking to. It was working in
the lab yesterday, and was moved into place this morning.&lt;/p&gt;

&lt;p&gt;We set up a fairly powerful desktop machine using Debian
Buster/Testing with several (five, I believe) RTL2838 DVB-T receivers
connected and visualize the visible cell phone towers using an
&lt;a href=&quot;https://github.com/marlow925/hopglass&quot;&gt;English version of
Hopglass&lt;/a&gt;.  A fairly powerfull machine is needed as the
grgsm_livemon_headless processes from
&lt;a href=&quot;https://tracker.debian.org/pkg/gr-gsm&quot;&gt;gr-gsm&lt;/a&gt; converting
the radio signal to data packages is quite CPU intensive.&lt;/p&gt;
                                        
&lt;p&gt;The frequencies to listen to, are identified using a slightly
patched scan-and-livemon (to set the --args values for each receiver),
and the Hopglass data is generated using the
&lt;a href=&quot;https://github.com/petterreinholdtsen/IMSI-catcher/tree/meshviewer-output&quot;&gt;patches
in my meshviewer-output branch&lt;/a&gt;.  For some reason we could not get
more than four SDRs working.  There is also a geographical map trying
to show the location of the base stations, but I believe their
coordinates are hardcoded to some random location in Germany, I
believe.  The code should be replaced with code to look up location in
a text file, a sqlite database or one of the online databases
mentioned in
&lt;a href=&quot;https://github.com/Oros42/IMSI-catcher/issues/14&quot;&gt;the github
issue for the topic&lt;/a&gt;.

&lt;p&gt;If this sound interesting, visit the stand at the festival!&lt;/p&gt;
</description>
        </item>
        
        <item>
                <title>Easier recipe to observe the cell phones around you</title>
                <link>http://people.skolelinux.org/pere/blog/Easier_recipe_to_observe_the_cell_phones_around_you.html</link>
                <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Easier_recipe_to_observe_the_cell_phones_around_you.html</guid>
                <pubDate>Sun, 24 Sep 2017 08:30:00 +0200</pubDate>
                <description>&lt;p&gt;A little more than a month ago I wrote
&lt;a href=&quot;http://people.skolelinux.org/pere/blog/Simpler_recipe_on_how_to_make_a_simple__7_IMSI_Catcher_using_Debian.html&quot;&gt;how
to observe the SIM card ID (aka IMSI number) of mobile phones talking
to nearby mobile phone base stations using Debian GNU/Linux and a
cheap USB software defined radio&lt;/a&gt;, and thus being able to pinpoint
the location of people and equipment (like cars and trains) with an
accuracy of a few kilometer.  Since then we have worked to make the
procedure even simpler, and it is now possible to do this without any
manual frequency tuning and without building your own packages.&lt;/p&gt;

&lt;p&gt;The &lt;a href=&quot;https://tracker.debian.org/pkg/gr-gsm&quot;&gt;gr-gsm&lt;/a&gt;
package is now included in Debian testing and unstable, and the
IMSI-catcher code no longer require root access to fetch and decode
the GSM data collected using gr-gsm.&lt;/p&gt;

&lt;p&gt;Here is an updated recipe, using packages built by Debian and a git
clone of two python scripts:&lt;/p&gt;

&lt;ol&gt;

&lt;li&gt;Start with a Debian machine running the Buster version (aka
  testing).&lt;/li&gt;

&lt;li&gt;Run &#39;&lt;tt&gt;apt install gr-gsm python-numpy python-scipy
  python-scapy&lt;/tt&gt;&#39; as root to install required packages.&lt;/li&gt;

&lt;li&gt;Fetch the code decoding GSM packages using &#39;&lt;tt&gt;git clone
  github.com/Oros42/IMSI-catcher.git&lt;/tt&gt;&#39;.&lt;/li&gt;

&lt;li&gt;Insert USB software defined radio supported by GNU Radio.&lt;/li&gt;

&lt;li&gt;Enter the IMSI-catcher directory and run &#39;&lt;tt&gt;python
  scan-and-livemon&lt;/tt&gt;&#39; to locate the frequency of nearby base
  stations and start listening for GSM packages on one of them.&lt;/li&gt;

&lt;li&gt;Enter the IMSI-catcher directory and run &#39;&lt;tt&gt;python
  simple_IMSI-catcher.py&lt;/tt&gt;&#39; to display the collected information.&lt;/li&gt;

&lt;/ol&gt;

&lt;p&gt;Note, due to a bug somewhere the scan-and-livemon program (actually
&lt;a href=&quot;https://github.com/ptrkrysik/gr-gsm/issues/336&quot;&gt;its underlying
program grgsm_scanner&lt;/a&gt;) do not work with the HackRF radio.  It does
work with RTL 8232 and other similar USB radio receivers you can get
very cheaply
(&lt;a href=&quot;https://www.ebay.com/sch/items/?_nkw=rtl+2832&quot;&gt;for example
from ebay&lt;/a&gt;), so for now the solution is to scan using the RTL radio
and only use HackRF for fetching GSM data.&lt;/p&gt;

&lt;p&gt;As far as I can tell, a cell phone only show up on one of the
frequencies at the time, so if you are going to track and count every
cell phone around you, you need to listen to all the frequencies used.
To listen to several frequencies, use the --numrecv argument to
scan-and-livemon to use several receivers.  Further, I am not sure if
phones using 3G or 4G will show as talking GSM to base stations, so
this approach might not see all phones around you.  I typically see
0-400 IMSI numbers an hour when looking around where I live.&lt;/p&gt;

&lt;p&gt;I&#39;ve tried to run the scanner on a
&lt;a href=&quot;https://wiki.debian.org/RaspberryPi&quot;&gt;Raspberry Pi 2 and 3
running Debian Buster&lt;/a&gt;, but the grgsm_livemon_headless process seem
to be too CPU intensive to keep up.  When GNU Radio print &#39;O&#39; to
stdout, I am told there it is caused by a buffer overflow between the
radio and GNU Radio, caused by the program being unable to read the
GSM data fast enough.  If you see a stream of &#39;O&#39;s from the terminal
where you started scan-and-livemon, you need a give the process more
CPU power.  Perhaps someone are able to optimize the code to a point
where it become possible to set up RPi3 based GSM sniffers?  I tried
using Raspbian instead of Debian, but there seem to be something wrong
with GNU Radio on raspbian, causing glibc to abort().&lt;/p&gt;
</description>
        </item>
        
        </channel>
</rss>